Magneto.



J. E. SEELEY.

MAGNETO.

APPLICATION FILED 1:. a1, 1911.

Patentfid. Feb. 13, 1 912.

f I7ZUe77/i07' 6 Jame ELSeeZCy.

operation, the armature according to the hereinafter.

and State of Califor1iia, have invented a lowing is a specification.

' for the construction of an armature in this ure 1 is a longitudinalvertical section of the 'of the. magneto on line w m in Fig. 1.

UNITED STATES g E F CEJ,

JAMES E. SEELEY, or nos ANGELES, CALIFORNIA, ASSIGNOR TO HIGH rnnounivcyIGNITION COIL COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OFCALIFORNIA.

MAGNETO.

Application filed January 31 1911. Serial No. 605,775.

To all whom it may concern: V

Be it known that I, JAMES E. SEELEY, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles new and usefulMagneto, of which the fol- This invention" relates to magnetos for usein connection with sparking systems, for example, in internal combustionengines, and the main object of the invention is to provide a magneto inwhich electromotive force will be generated effectively throughout alarge range, thereby permitting a correspondingly large rangeforadvancement of the spark. In order. to provide for such presentinvention is laminated in planes parallel to the axis of rotation, andthe 111- ventio'n is directedparticularly to means manner Whileproviding effective and rigid support and connection of the severalparts of the armature.

Other objects of the invention will appear The accompanying .drawingsillustrate the invention, and referring thereto: Flglower portion of themagneto embodying the invention. Fig; 2 1s a transverse section Fig. 3is a perspective of the armature core. 1 designates the base of amagneto, 2 the field magnets thereof, and 3.the polepieces secured tosaid field magnets and to the base, and embracing the armature.

The armature comprises heads or end members 5 and 6. means forrotatively supporting said heals, a core and pole pieces 8 connectingsaid'heads. The head 5 may consist of a disk having a hub 9 secured to ashaft 10, said shaft being mounted by bearing-11. in a fixed head 12 onthe endof the base, and said shaft being provided with means indicatedat 13 for connection to the driving means. Head 6 is secured to a sleeveor hollow shaft 4, through which passes the conductor 19 for connectionto the usual current connecting means not shown, said connector beinginsulated by insulating sleeve 14. Said hollow shaft -1- is journaled bybearing 15 in a head 16 at a corresponding 'end of the base.

The core 70f the armature consists of a plurality of plates orlaminations 7, said plates extending in planes parallel to the axis ofrotation of the armature. Said plates are preferably H-shaped having acontracted middle portion 17 and extended outer portions or extnsiwns 18at each end toenable the winding ii dicated at 20, to be wound on saidcentral portion, and between said extensions. Said core may be retainedin place by seating or fitting of said extensions in notches 21. iiiflanges 22 on the heads 5 and 6. The pole pieces 8, which are formed assegmental plates, fit over said fianges and core, and are .held in placeby screws indicated at 23, said pole pieces holding the core fromtransverse displacement and also connecting the heads 5 and 6 together.

The pole pieces 8 are of sufficient circumferential or angular extensionto enable thenrto span the space 24 between the pole pieces 3 of thefield magnet. Good results may be obtained by making the angularextension of the armature pole pieces about 88 andthe angular extensionof the field magnet pole pieces about 110, giving an overlap of, say 18.With such construction of the pole pieces, I have found thateffectiveelectromotive force is generated in the armature throughout a range ofsubstantially 75. Animportant feature contributing to this result is thearrangement of the laminations in planes parallel to the axis ofrotation as distinguished from transverse to said axis. lVithlaminations in planes transverse to the axis of rotation, the lines offorce through the core tend to concentrate along lincsof minimum length,so that when conditions, the period of maximum electro motive force inthe circuit, as the magnetic flux is then changing most rapidly. Butwith the laminations parallel to the axis of rotation, the lines offorce are not permitted to cross obliquely through the core, butsubstantially follow the laminations, so that when the armature polepieces are in the positions referred to, the core offers a greaterreluctance by reason of the distortlon of the magnetic lines of force,than when the annature pole pieces are directly opposite the fieldpolepieces so as to allow the magnetic flux to pass through the laniinationsWithout distortion and, therefore, with minimum iresistance. -The effectof this is to increase the magnetic flux continuously, and more oruniformly from the time when the torwerd edge of the armature polepiececoines under the rear edge of the field pole pieceto the time whenthe armature pole pieces are directly opposite the field pole pieces,this connorms? What I claim is: in a magneto, the combination with. thetield pole pieces of an nature, mounted to rotate between said polepieces and comprising heads having o notches, 2-: core consisting of Htot-1n; ninations having arms extending into e tclics the laminations inpieces secured. over and in c, U 'wi In testiniion gz Winn-eo1 my handLos Angeles, 245th day of January Fit ill.

11in ES E. SEELFY.

